class Person:
    def __init__(self,name,weight):
        self.name = name;
        self.weight = weight;

    def __str__(self):
        return ("我的名字 是 %s, 体重是 %.2f" %(self.name,self.weight));

    #小明爱跑步
    def enjoy_run(self):

        print("%s 爱跑步 每跑一天体重减 %.2f 公斤" %(self.name,0.5));
        self.weight = self.weight - 0.5;

    # 小明爱吃东西
    def enjoy_eat(self):
        print("%s是吃货  吃完了在减肥" % (self.name));
        self.weight += 1;